
monitor_changes(+Vars, +Templates, +Prio, +CondList, +AttrMod, -ChangeStream)

   Monitor variables for modifications

Arguments
   Vars                A list containing variables
   Templates           A list of terms corresponding to the variables
   Prio                Priority for the monitoring demons
   CondList            Suspension list spec
   AttrMod             Suspension list attribute module
   ChangeStream        A lazy list of lists of changes

Type
   library(changeset)

Description

    Like monitor_changes_arr/5, but (instead of array indices) the
    ChangeStream contains the elements of the Templates-list that
    correspond to the modified variables, thus allowing arbitrary
    information to be conveyed to the code that processes the changes.
    
    [eclipse 10]: X1::1..9, X2::1..8,
	    monitor_changes([X1,X2],[info(1,X1),info(2,X2)], 8,
			    [min of fd, max of fd], fd, Stream),
	    X1 #> X2, X2 #>= 5.

    Stream = [[info(1, X1{[6..9]})], [info(2, X2{[5..8]}), info(1, X1)]|More]
    X1 = X1{[6..9]}
    X2 = X2{[5..8]}
    
    


